Summary
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
This Airworthiness Directive (AD) is prompted by the discovery on L 23 SUPER-BLANIK sailplanes of cracks in zones where the front and aft control levers attach the connecting rod designated as "control bridge'' on the relevant Illustrated Parts Catalogues (IPC). If left uncorrected cracks could propagate and lead to the breakage of the connecting rod with subsequent loss of control of the sailplane.
The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.